150m long train takes 10s to pass a man who is going in the same direction at the speed of 2kmph. What is the speed of the train?
56kmph
Data inadequate
52kmph
84kmph
A
Data inadequate
B
52kmph
C
56kmph
D
84kmph
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Solution
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Let the speed of the train be xkmph
Length of the train =150m=1501000=320km and time taken to cross the man = 10 seconds = 1060×60 Relative speed = (x−2)kmph (Both are moving in same direction) We know that, Length of the trainRelative speed= Time taken to cross the man Relative speed = 3×36020×1 x−2=3×36020×1 x=54+2=56kmph Hence, speed of train is 56kmph.
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